how to fft of a signal taken from an accelerometer data.

The MicroStrain G-Link is accelerometer with dynamic range of ±2g and can measures vibration in three different orientations; X, Y and Z. G-Link wireless accelerometer is chosen for the monitoring of ambient vibration source due to the reasons that it is small, portable and can be mounted easily even at a crowded space. To make measurement and monitoring the ambient vibration sources using G-Link, the device has to be mounted firmly on the surface of the vibration sources, ideally either bolted to the surface or mounted with strong magnet. Once the accelerometer node is secured, the G-Link firmware is used to activate the G-Link triggering process. Once the G-link is triggered, it captures the vibration raw data from the vibration sources. This data is then transmitted wirelessly to the USB base station and finally the data is processed by the host computer. The USB base station is connected to the host computer via USB connection. The data is then further analysis using a software provided by the manufacturer, where the raw data which is in the time domain is transformed into frequency domain by using FFT, so that, the processed data in the terms of vibration frequency and acceleration level can be clearly presented.

how to fft of a signal taken from an accelerometer data.

Answer 1

[Carlos]

If you can apply xlsread(as I infere from your tags) to put your raw data into a matlab vector all you need can be found in this link

http://www.mathworks.es/es/help/matlab/ref/fft.html

I have worked with accelerometers too, and the manufaturer gives the sampling frequency(which you need to know)in the specefication sheet.

[Carlos]

You should see the single side spectrum well with that code.